hazard groupingA 4-tier system for stratifying the risk of human disease after exposure to biological agents (pathogens):
Unlikely to cause disease in immunocompetent hosts.
Pathogenic, but unlikely to spread to the community if the infection is appropriately managed or prophylactic measures are taken.
Actinomyces, Clostridia spp, HSV, HPV, MRSA.
Can cause severe disease and spread to the community, despite adequate management and/or prophylactic measures.
HBV, HCV, HIV, SARS, Salmonella typhi, Mycobacterium tuberculosis, Brucella, Q fever, anthrax.
Highly contagious, cause severe disease; there is no effective therapy.
Rabies, smallpox and viral haemorrhagic fevers (e.g., Ebola and Lassa).